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Tasked by the Department of Homeland Security, the 2011 JASON Summer Study focused on the impact of space weather on the electric grid, seeking to understand 1) the current status of solar observations, warnings, and predictions, 2) the plausibility of Mr. Kappenman’s worst-case scenario, 3) how previous solar storms have affected some power grids, and 4) what can be done at reasonable cost to protect our grid. This report builds on two previous JASON studies of different aspects of the U.S. electric grid.